VIA1B_vRTCClk
reg = via1[vBufB] & ~VIA1B_vRTCClk;
via1[vBufB] = reg | VIA1B_vRTCClk;
reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
via1[vBufB] = reg | bit | VIA1B_vRTCClk;
via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
via1[vDirB] |= VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData;
via1[vBufB] |= VIA1B_vRTCEnb | VIA1B_vRTCClk;